Very Curious??!!! Anyone With 911 Experience Please Respond ...

With an offer of permanent employment if i successfully complete the background check, polygraph, hearing test, drug test, and two psychological exams (one written and the other verbal). Now i am not concerned with the drug ... I just want to know what type of questions they will ask? I really want this job and i was told as long as your truthful it shouldn't count against you but i still concerned because with a polygraph its only yes or no you cant explain anything. ...